/*
 * Copyright (c) 2011-2012 Alexander Dubu
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * o  Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * o  Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * o  Neither the name Axil nor the names of its contributors may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package axil.definition;

import axil.framework.localization.Namespace;
import axil.framework.validation.Validated;
import axil.framework.validation.ValidationContext;
import axil.framework.xml.InputXML;

import javax.xml.bind.annotation.XmlType;

import static axil.framework.Functions.*;


/**
 * An object representing the code elements of an XML definition file. Code can
 * be expressed as native Java objects or as Axil script.
 */
@XmlType
public class Code implements Validated {
	private static final Namespace ns = Definition.ns;

	private boolean nativ;
	private String clss;
	private Evaluation evaluation;
	private String code;


	public Code(InputXML xml) {
		nativ = xml.bool("native", false);
		clss = xml.text("class", null);
		evaluation = xml.ordinal("evaluation", Evaluation.values(), Evaluation.eager);
		code = xml.content();
	}


	public boolean isNative()			{
		return nativ;
	}
	public String classname()			{
		return clss;
	}
	public Evaluation evaluation()		{
		return evaluation;
	}
	public String script()				{
		return code;
	}


	/**
	 * Validate this object in the given context. Any problems detected with the
	 * correctness or completeness of this object are placed into the context.
	 * This method descends into its owned members, validating them as well.
	 */
	public void validate(ValidationContext context) {
		if (nativ) {
			context.check("class", ! empty(clss), msg(ns, "missing-native-class"));
			try {
				classof(clss);
			} catch (Exception ex) {
				context.error(msg(ns, "cannot-find-function"));
			}
		} else {
			context.check("class", empty(clss), msg(ns, "class-for-non-native"));
			context.check("code", ! empty(code), msg(ns, "no-implementation-code"));
		}
	}
}
